A Sikh worshipper, the sole hospitalised victim of the Wisconsin Gurdwara shooting, is no longer in intensive care unit and is making slow and gradual recovery, his family has said.

"He is no longer in the intensive care unit and now is making a slow and gradual recovery," family members of Punjab Singh said in a statement issued through the local Froedert Hospital where he is receiving treatment.

"Our beloved father, Punjab Singh, was severely injured on that terrible August day. Despite the heroic efforts of emergency responders at the scene and the medical care he received from trauma specialists and other doctors at Froedtert Hospital, he has not fully recovered," it said.

Singh, 65, suffered a single gunshot wound to the face that caused facial fractures and damage to his right carotid and vertebral artery when a 40-year-old former US Army specialist went on a rampage, killing six Sikh worshippers and wounding three on August 5.

His family members expressed gratefulness for the many messages of support they have received.

"It is a comfort for us to know people are keeping our father in their thoughts and prayers," the statement said.